is it necessary to put something under the egg during lockdown & hatch

My incubator is like the one below.
I've noticed a lot of people have the eggs on paper towel or some other surface other than the wire.
I haven't done that in the past.
Is it recommended? What material is safest? I have an unrealistic fear of house fires so the papertowel so close to a heat source makes me a bit nervous but clearly you guys know what your doing so I'd love to hear what you think.
We go on lock down after tonight.

I'm new here and we're from the same nation. I've read almost your posts and really enjoy them. Anyway, as what you've told .. we come from a truly exceptional nation that have thousands islands with different developmental condition. I'm kinda a lucky guy to stay in a metropolitan city located in Java Island where electrical is far more stable than in your region. I can easily too find high-tech components and equipments needed for hatching or raising chickens.

But you know how dense is the population here and it is impossible and expensive thing to build a coop. Neighbors would kill me if i bother to build one You're a lucky guy to have a coop. You know, sometimes I dream to have a farm or even a ranch where my daughters can play on the ground with horses and goats

I was born in a little village, the most underdeveloped one in East Java. But i failed to survive there since i do not have any skill to be a farmer although i wish i could. I love animals but do not have place for them. But I plan to have it of course. The first thing I do is joining this community and prepare myself to be 'Old Mac Donald that have a farm' ..... i a i a ooooooo